mediocrity vs superiority

mediocrity

noun
  • The condition of being mediocre; having only an average degree of quality, skills etc.; no better than standard. 

  • An individual with mediocre abilities or achievements. 

superiority

noun
  • The right which the superior enjoys in the land held by the vassal. 

  • The state of being superior. 

How often have the words mediocrity and superiority occurred in a corpus of books? (source: Google Ngram Viewer )